I'm looking at these online , mainly for my DD who has quite sensitive dry skin , but my DS could try one (different sponge obvs, 
)
So - where do I buy them?
I'm guessing there are 'proper' ones and a shed load of copies.
Charcoal for DS and Bamboo for DD ? Or the Red Clay?
I think I've seen them in TKMaxx.
Any brands I should look for (and more importantly , any to avoid? )
I need ones with the little loop to hang them
TIS